MFSA2026-23: Security Vulnerabilities fixed in Thunderbird 149

Published Mar 24, 2026
·
Updated

Security Vulnerabilities fixed in Thunderbird 149

Affected Software

1 affected componentFixes available
Mozilla Thunderbird<149
149

Event History

Mar 24, 2026
Advisory Published
via Mozilla·12:00 AM
Data Sourced
via Mozilla·12:00 AM
DescriptionSeverityAffected Software
Free Weekly Intel

Don't miss critical vulnerabilities

Join thousands of security professionals who receive our weekly digest of trending CVEs, zero-days, and exploited vulnerabilities.

No spam. Unsubscribe anytime.

Frequently Asked Questions

1

What is the severity of MFSA2026-23?

The severity of MFSA2026-23 is considered critical as it addresses multiple security vulnerabilities in Thunderbird.

2

How do I fix MFSA2026-23?

To fix MFSA2026-23, users should upgrade to Thunderbird version 149 or later.

3

What types of vulnerabilities are addressed in MFSA2026-23?

MFSA2026-23 addresses security vulnerabilities that could lead to remote code execution and data leaks.

4

Who is affected by MFSA2026-23?

Users of Mozilla Thunderbird versions prior to 149 are affected by MFSA2026-23.

5

When was MFSA2026-23 announced?

MFSA2026-23 was announced in conjunction with the release of Thunderbird 149.

Contact

SecAlerts Pty Ltd.
132 Wickham Terrace
Fortitude Valley,
QLD 4006, Australia
info@secalerts.co
By using SecAlerts services, you agree to our services end-user license agreement. This website is safeguarded by reCAPTCHA and governed by the Google Privacy Policy and Terms of Service. All names, logos, and brands of products are owned by their respective owners, and any usage of these names, logos, and brands for identification purposes only does not imply endorsement. If you possess any content that requires removal, please get in touch with us.
© 2026 SecAlerts Pty Ltd.
ABN: 70 645 966 203, ACN: 645 966 203